Java Tutorial/Servlet/URL Rewrite — различия между версиями

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Текущая версия на 05:07, 1 июня 2010

Servlet Query String

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class MyServlet extends HttpServlet {
  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();
    out.println("Query String:");
    out.println(req.getQueryString());
    out.println();
    out.println("Request Parameters:");
    Enumeration e = req.getParameterNames();
    while (e.hasMoreElements()) {
      String name = (String) e.nextElement();
      String values[] = req.getParameterValues(name);
      if (values != null) {
        for (int i = 0; i < values.length; i++) {
          out.println(name + " (" + i + "): " + values[i]);
        }
      }
    }
  }
}





Servlet URL Rewrite

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class MyServlet extends HttpServlet {
   
 public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, java.io.IOException {
        
        response.setContentType("text/html");
        java.io.PrintWriter out = response.getWriter();
        String contextPath = request.getContextPath();
        String encodedUrl =  response.encodeURL(contextPath + "/default.jsp");
       
        out.println("<html>");
        out.println("<head>");
        out.println("<title>URL Rewriter</title>");  
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>This page will use URL rewriting if necessary</h2>");
        out.println("Go to the default.jsp page 



==  URL rewriting ==






   
  <!-- start source code -->
   
    <source lang="java">
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class CounterRewrite extends HttpServlet {
  static final String COUNTER_KEY = "Counter.count";
  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
      IOException {
    HttpSession session = req.getSession(true);
    resp.setContentType("text/html");
    PrintWriter out = resp.getWriter();
    int count = 1;
    Integer i = (Integer) session.getAttribute(COUNTER_KEY);
    if (i != null) {
      count = i.intValue() + 1;
    }
    session.setAttribute(COUNTER_KEY, new Integer(count));
    out.println("<html>");
    out.println("<head>");
    out.println("<title>Session Counter</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("Your session ID is <b>" + session.getId());
    out.println("</b> and you have hit this page <b>" + count
        + "</b> time(s) during this browser session");
    String url = req.getRequestURI();
    out.println("<form method=GET action=\"" + resp.encodeURL(url) + "\">");
    out.println("<input type=submit " + "value=\"Hit page again\">");
    out.println("</form>");
    out.println("</body>");
    out.println("</html>");
    out.flush();
  }
}


Источник — «http://jexp.ru/index.php?title=Java_Tutorial/Servlet/URL_Rewrite&oldid=4934»